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ceph: sync read inline data

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we can't use getattr to fetch inline data while holding Fr cap,
because it can cause deadlock. If we need to sync read inline data,
drop cap refs first, then use getattr to fetch inline data.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2014-11-14 22:36:18 +08:00
committed by Ilya Dryomov
parent 3738daa68a
commit 83701246ae
2 changed files with 116 additions and 13 deletions
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63
fs/ceph/file.c
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@@ -333,6 +333,11 @@ int ceph_release(struct inode *inode, struct file *file)
return 0;
}
enum {
CHECK_EOF = 1,
READ_INLINE = 2,
};
/*
* Read a range of bytes striped over one or more objects. Iterate over
* objects we stripe over. (That's not atomic, but good enough for now.)
@@ -412,7 +417,7 @@ more:
ret = read;
/* did we bounce off eof? */
if (pos + left > inode->i_size)
*checkeof = 1;
*checkeof = CHECK_EOF;
}
dout("striped_read returns %d\n", ret);
@@ -808,7 +813,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
struct page *pinned_page = NULL;
ssize_t ret;
int want, got = 0;
int checkeof = 0, read = 0;
int retry_op = 0, read = 0;
again:
dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
@@ -830,8 +835,12 @@ again:
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
/* hmm, this isn't really async... */
ret = ceph_sync_read(iocb, to, &checkeof);
if (ci->i_inline_version == CEPH_INLINE_NONE) {
/* hmm, this isn't really async... */
ret = ceph_sync_read(iocb, to, &retry_op);
} else {
retry_op = READ_INLINE;
}
} else {
dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
@@ -846,12 +855,50 @@ again:
pinned_page = NULL;
}
ceph_put_cap_refs(ci, got);
if (retry_op && ret >= 0) {
int statret;
struct page *page = NULL;
loff_t i_size;
if (retry_op == READ_INLINE) {
page = __page_cache_alloc(GFP_NOFS);
if (!page)
return -ENOMEM;
}
if (checkeof && ret >= 0) {
int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
statret = __ceph_do_getattr(inode, page,
CEPH_STAT_CAP_INLINE_DATA, !!page);
if (statret < 0) {
__free_page(page);
if (statret == -ENODATA) {
BUG_ON(retry_op != READ_INLINE);
goto again;
}
return statret;
}
i_size = i_size_read(inode);
if (retry_op == READ_INLINE) {
/* does not support inline data > PAGE_SIZE */
if (i_size > PAGE_CACHE_SIZE) {
ret = -EIO;
} else if (iocb->ki_pos < i_size) {
loff_t end = min_t(loff_t, i_size,
iocb->ki_pos + len);
if (statret < end)
zero_user_segment(page, statret, end);
ret = copy_page_to_iter(page,
iocb->ki_pos & ~PAGE_MASK,
end - iocb->ki_pos, to);
iocb->ki_pos += ret;
} else {
ret = 0;
}
__free_pages(page, 0);
return ret;
}
/* hit EOF or hole? */
if (statret == 0 && iocb->ki_pos < inode->i_size &&
if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
ret < len) {
dout("sync_read hit hole, ppos %lld < size %lld"
", reading more\n", iocb->ki_pos,
@@ -859,7 +906,7 @@ again:
read += ret;
len -= ret;
checkeof = 0;
retry_op = 0;
goto again;
}
}